Preheat oven to 350 degrees. Mix together cake mix, pudding mix, greek yogurt, eggs, and oil. Set aside.
Mix together sugar, cocoa powder, cinnamon, and chocolate chips. Pour 1/3 batter into a well greased bundt pan. top with 1/3 cinnamon and sugar/chocolate mixture. Repeat 2 more times, ending with a layer of cinnamon and sugar/chocolate chips.
Bake 1 hour. Allow to cool about 10 minutes before loosening with a knife and inverting onto a serving plate. Allow to cool completely and sprinkle top with powdered sugar. Store in an airtight container for up to one week.
Store covered at room temperature up to 5 days or chilled up to 7 days.